Why should a magnesium ribbon be cleaned before burning in air?

When a magnesium ribbon is burnt in air, the ash formed is

Why should we breed animals?

Why should bio diversity be conserved ?

Sanjana wants to buy a jam bottle in a grocery shop . What are the things she should observe on the label before purchasing it .

When a magnesium ribbon is burnt in air, the ash formed is _____.

Why should the light dependent reaction occur before the light independent reaction?

(i) How are chromosomes classified based on the position of centromere? (ii) Why should the light dependent reaction occur before the light independent reaction?